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(No Model.) 2 Sheets-Shet 1. J. STU'MPF.

VALVE MOTION FOR PUMPS- Patented Feb. 4, 1896.

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(No Model.) 2 Sheets-Sheet 2.

J. ST-UMPF. VALVE MOTION FOR PUMPS.

Patented Peb...4, 1896..

UNITED STATES PATENT OFFICE,

JOHN STUMPF, OF CI-IARLO'ITENBURG, GERMANY.

VALVE-MOTION FOR PUMPS.

SPECIFICATION forming part of Letters Patent No. 553,878, dated February 4, 1896.

Application filed F b r 16, 1893. Serial No. 462,656. (No model.) Patented in Germany July 20, 1890, No. 62,005; in France August 4, 1890, No. 207,401, and September 13, 1892,110. 224,304; in England March 18,1892,N0. 5,340, and August 18, 1892,1I0. 14,913 5 in Switzerland March 28, 1892, No. 5,027, and in Belgium August 18, 1892,1T0. 14,913.

To all whom zit may concern.-

Be it known that I, JOHN STUMPF, a subject of the King of Prussia, German Emperor, and a resident of Oharlottenburg, near Berlin, in the Kingdom of Prussia, German Empire, have invented a new and useful Improved Valve-Motion for Pumps, (for which patents have been obtained in Germany, No. 62,005, dated J uly 20, 1890, and additional patent dated July 20,1892 in Switzerland, No. 5,027, dated March 28, 1892; in France, No. 207,401, dated August 4,1890, and No. 224,304, dated September 13, 1892; in Belgium, No. 14,913, dated August 18, 1892, all these patents being granted to Julius Maemecke, of Berlin, Germany; in Great Britain, No. 5,340, dated March 18, 1892, and No. 14,913, dated August 18, 1892, granted to George T. Hyde as communication from Julius Maemecke, of Berlin,) of which the following is an exact specification.

My invention relates to an improved valvemotion for pumps; and it consists in timing this motion in such a manner that the opening of the suction-valves and of the deliveryvalves is effected compulsorily by means of cranks and cams, or equivalent mechanisms, and occurs before the change of the plungers stroke, whereas the closure of the corresponding delivery-valves and suction-valves may be efiected by springs, weights, water-pressure, or any other means having a continuous action, and takes place simultaneously with the opening of the other valves, or nearly so.

My invention will be more readily understood by reference to the accompanying drawings, in which- Figure 1 represents a pump embodying my improvements. Fig. 2 is another form of construction to the same effect. Fig. 3 is a longitudinal elevation, partly in section, of another pump having a somewhat different mechanism for. operating the valves. Fig. 4

is a cross-sectional elevation of the same. Fig. 5 shows a further modification of the mechanism for operating the valves.

Like letters denote corresponding parts in all the views.

In Fig. 1, which illustrates my invention in its preferred form, I show a double-acting pump, the valves of which are connected with and operated by the reciprocating or sliding valve of the steam-engine with which the pump is connected, and by which it is driven.

e designates the eccentric which imparts motion to the valve of the driving-engine in the usual manner.

In carrying out my invention I give the valve of the engine a slight lead by setting the eccentric forward in advance of the stroke of the piston, say from twenty degrees to thirty degrees, as indicated by the diagram at the left of Fig. 1, in which the arcs a b and c (1 represent such angular advance or lead, whereby steam is admitted and out oif slightly in advance of the change of stroke of the engine. This in itself is common, but in connection with my invention forms an important feature.

The pump comprises two cylinders in axial alignment with each other and a reciprocating plunger or piston common to both, as usual in double-acting pumps, and this piston is connected with and actuated by the piston of the driving-engin e, as is also common. Each of the pump-cylinders is provided with an induction-valve I and an eduction-valve II, said valves being located opposite each other and movable in radial directions, and yielding'ly held to their seats by springs G G Diagonallybelow and at adjacent sides of the induction -valves of the two cylinders are short transverse shafts B 0, each provided with angular crank-arms e e", and vertically above these shafts and above the eductionvalves are similar shafts D E, each provided with a crank-arm f. The two arms e" e extend outwardly or away from each other,while the arms ff of the upper shafts extend inwardly, or toward each other. The two arms 6 e, which are vertical, are coupled together by a connecting-rod e and to the valve-stem a by a rod 1), and the arms 6 c are coupled with the arms f f of the respective upper shafts by connecting-rods g.

It will thus be seen that the reciprocating movements of the steam-valve and its stem 0 impart synchronous oscillatorymovements to the four shafts and that the upper and lower connected shafts oscillate simultaneously in opposite directions.

Each of the shafts B O D E is provided also with an arm L, the said arms being adapted and arranged to engage and open the respective valves against the pressure of their springs.

It will now be understood from the foregoing that the induction-valves are positively opened alternately, that the eduction-valves are also positively opened alternately, that the induction-valve of one cylinder and the eduction-valve-of the other cylinder are positively opened simultaneously, and that these operations are eifeeted before the piston or plunger changes stroke, the interval in time depending on the advance angularity of the eccentric e, or, in other words, on the amount of lead given the steam-valve.

Supposing the eccentric to be turning toward the right, as id-cwed in Fig. 1, steam is cut off at the points a (Z while the change of stroke takes place at the points 0 b the eccentric (and consequently the valve) in the meantime traveling through the angular distance (Z c or a N, during which time the induction-valve on the receiving side of the pump is released to the action of its spring, that on the delivery side opened, the eduction-valve on the receiving side opened, and that on the delivery side released and allowed to close.

The operation of this valve mechanism is as follows: lVhen the eduction-valve of the moved, the eduction-valve having been released and allowed to close and the inductionvalve positively opened for the backflow and escape of the water then remainingin the cylinder. into the steam-cylinder of the driving-engine, and it will be obvious that the piston will be under the full pressure of the steam at the? change of stroke and that the plunger will at the same time be subjected to the full waterpressure acting in the opposite direction. Thus theSteanrpressure is assisted by the water-pressure at the completion of the stroke, and shocks and strains are avoided, rendering it practicable to employ a lighter drivinggcarthan would otherwise be required. It

will thus be apparent that in calculating the dimensions and strength of the driving-gear the calculations may be based on the difference between the steam and waterpressures, whereas hitherto they were necessarilybased At the same time steam is admitted upon the sum of these pressures for the reason that in all pumps of which I have knowl edge the water-pressure acted in opposition to the steam-pressure.

In the modification illustrated in Fig. 2 the four valve-operating shafts I I II II are connected with an oscillating disk Q, mounted at the side of the pump between the two cylinders thereof and actuated by the connecting-rod b, which is connected therewith in a line or plane passing vertically through the axis of oscillation. The action is substantially the same as above described with reference to Fig. 1.

In the modification shown in Fig. 3 the arrangement is substantially the same as that shown in Fig. 2, with the exception that in this case I show a steam-cylinder provided with rotary or oscillating valves V, which are coupled with a plate Q mounted at theside of the cylinder and actuated by the connecting-rod b, as before, the said plate Q being connected by a rod R with a similar plate Q, which corresponds with the plate Q, of 2, and is similarly connected with the pumpvalves. In this case also the eccentric (here marked a) has its rod connected with a lever Z, fulerumed at Z, and connected at its swinging end with the connecting-rod ZJ.

In the further modification shown in Fig. 5 the eccentric 6, its rod a", the lever Z, connecting-rod (here marked 19') and oscillating disk Q are the same as in Fig. 3. In this case, however, the disk Q is connected di rectly with the shaft which operates the eduction-valve of the first pump-cylinder, which shaft is connected with the corresponding shaft of the second cylinder, this with the shaft which operates the inductionalve of the same cylinder, and this in turn with the shaft which controls the induction-valve of the first cylinder, motion being thus transmitted from one shaft to the other throughout the series.

My improved valve-motion somewhat reduces the capacity of the pump, but this is more than compensated for by the reduction in the power required to operate it, this re duction being the result of cutting off the water-pressure at the delivery side and applyin g it at the receiving side to assist thesteampressure in effecting the change of stroke, as above explained, so that in reality I have an increased efficiency in proportion to the weight of the driving mechanism and the power expended.

It will be understood that it is not necessary that the induction and eduction valves be operated synchronously, as above described. The induction-valve of the delivery side of a double-acting pump maybe opened before the eduction-valve on the same side is closed, and in like manner theeduction-valve on the suction side maybe closed before the induction-valve; and I do not, therefore, in tend to limit my invention to the exact (16* IIO tails of construction and arrangement of parts hereinbefore described, the essence of the invention consisting in cutting 01f or removing the back-pressure of the raised water previous to the change of stroke of the plunger or piston, and any mere modification whereby this is effected in substantially the manner herein described is to be regarded as falling within the scope of my invention.

WVhat I claim, and desire to secure by Letters Patent, is

1. In a double-acting pump, the combination with the induction and eduction valves, of means connected with and operated by the driving-gear for positively opening the eduction-valve at the receiving side or end and the induction-valve at the delivery side or end prior to the change of stroke, as specified.

2. In a double-acting pump, the combination with the induction and eduction valves of means connected with and operated by the driving mechanism for positively opening the eduction-valve at the receiving side or end and the induction-valve at the delivery side or end prior to the change of stroke, and means for simultaneously closing the induction-valve at the receiving side and the eduction-valve at the delivery side, as specified.

3. In a double-actin g steam-pump, the combination with the valve of the driving-engine and with the induction and eduction valves of the pump, of connections between the steamvalve and the pump-valves for positively opening the latter, said connections being ar-- JOHN STUMPF.

WVitnesses 2 R. HERPICH, H. GENEHR. 

